Open AccessIMPERMEABLE THIN AL2O3 OVERLAY FOR TBC PROTECTION FROM SULFATE AND VANADATE ATTACK IN GAS TURBINES
Author(s) -
Scott X. Mao
Publication year - 2004
Language(s) - English
Resource type - Reports
DOI - 10.2172/833299
Subject(s) - thermal barrier coating , corrosion , materials science , yttria stabilized zirconia , overlay , coating , thermal spraying , vanadate , metallurgy , sulfate , composite material , cubic zirconia , ceramic , computer science , programming language
To improve the hot corrosion resistance of YSZ thermal barrier coatings, a 25 {micro}m and a 2 {micro}m thick Al{sub 2}O{sub 3} overlay were deposited by HVOF thermal spray onto to the surface of YSZ coating. Oxidation at high temperature and hot corrosion tests showed that Al{sub 2}O{sub 3} overlay deposited on the YSZ TBCs surface can not only reduce the hot corrosion rate, but also significantly prevents the bond coat from oxidation